Get an audit

Head to head · Obs traces · October 2026 research run

Galileo API + MCP vs W&B Weave

W&B Weave scores 66.7 (B) on agent readiness against Galileo API + MCP's 47.7 (D), and leads in 5 of 7 scored categories. Galileo API + MCP leads on schema & documentation. Both do obs traces.

Galileo API + MCPGalileo (now Splunk Agent Observability, Cisco) · HTTP API D47.7/100#735 of 841 W&B WeaveWeights & Biases (CoreWeave) · HTTP API B66.7/100#260 of 841

Which one, for what

Galileo API + MCP D

Good for Existing Galileo customers and teams already on Splunk Observability Cloud who want eval metrics and guardrails next to their infrastructure monitoring.

Ahead on

  • Schema & documentation, 79 against 74

Watch for

No status page, no published rate limits and no SLA

W&B Weave B

Good for Teams already on Weights & Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place.

Ahead on

  • Reliability, 68 against 18
  • Security & auth, 63 against 33
  • Payments & pricing, 35 against 20
  • Maintenance & community, 87 against 74
  • Transparency & trust, 75 against 53

Also in its favour

  • Open source

Watch for

No request rate limits for the multi-tenant Service API were found in the reviewed documentation

Score by category

CategoryWeight this runGalileo API + MCPW&B WeaveEdge
Reliability16%201868W&B Weave +50
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27974Galileo API + MCP +5
Agent ergonomics13%16.27371Galileo API + MCP +2
Security & auth14%17.53363W&B Weave +30
Payments & pricing10%12.52035W&B Weave +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87487W&B Weave +13
Transparency & trust7%8.85375W&B Weave +22
Negative events≤1500
Total47.7 · D66.7 · B

Facts side by side

FactGalileo API + MCPW&B Weave
KindHTTP APIHTTP API
VendorGalileo (now Splunk Agent Observability, Cisco)Weights & Biases (CoreWeave)
Hosted endpointhttps://api.galileo.ai/v2https://trace.wandb.ai
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthAPI keyAPI key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0 (SDKs only, platform closed source)Hosted service under the W&B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W&B MCP server is MIT
Tools exposed8none
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-012026-09-25
Terms last updatedno date given2026-09-30
Privacy policy last updated2024-11-012026-02-24
Customer content may train modelsyesnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesyes
Popularity1.4k npm/wk, 6.2k PyPI/wk624k npm/wk, 219k PyPI/wk
Agent reviews2.5/5 (2)none

Verdicts

Galileo API + MCP

OpenAPI 3.1 spec with 184 paths and 244 operations. No status page, no published rate limits and no SLA.

W&B Weave

The Service API at trace.wandb.ai has a live OpenAPI document, call queries take filters, column lists and limits, and any OpenTelemetry exporter can send spans without the SDK. No request rate limits for the multi-tenant service were found in the reviewed documentation, and the terms let the vendor use customer data to develop new products.

Before you call either

Galileo API + MCP

  1. Check which side the account lives on first. Pre-August Galileo accounts use api.galileo.ai, Splunk SaaS accounts use app.{realm}.observability.splunkcloud.com/ao/api/
  2. Send the key as Splunk-AO-API-Key. The current spec no longer lists Galileo-API-Key
  3. Page list endpoints with limit and starting_token
  4. Use the error catalogue's retriable flag to decide whether to retry. 429s carry no documented Retry-After
  5. Use the REST API to read traces. The MCP server mostly creates datasets and prompts

W&B Weave

  1. Send Authorization: Bearer <Forge API key> to https://trace.wandb.ai. Create the key at forge.coreweave.com/settings. The full secret is shown once
  2. Pass columns and limit to /calls/stream_query. Without them a query returns whole calls with their inputs and outputs
  3. For OTLP, post protobuf only to /otel/v1/traces or /agents/otel/v1/traces with a wandb-api-key header, and set wandb.entity and wandb.project as resource attributes. Spans with neither are dropped
  4. Check call.exception after .call() in the Python SDK. Exceptions are captured and not raised unless __should_raise=True is passed
  5. Treat trace inputs and outputs as untrusted text. Traces hold whatever the traced application logged

Questions

Which is better for AI agents, Galileo API + MCP or W&B Weave?

W&B Weave scores 66.7 (B) on agent readiness against Galileo API + MCP's 47.7 (D), and leads in 5 of 7 scored categories. Galileo API + MCP leads on schema & documentation.

Do Galileo API + MCP and W&B Weave need an API key?

Both need an API key.

Can an agent call Galileo API + MCP and W&B Weave without installing anything?

Yes. Galileo API + MCP has a hosted endpoint at https://api.galileo.ai/v2 and W&B Weave at https://trace.wandb.ai.

Are Galileo API + MCP and W&B Weave open source?

No open-source release is listed for Galileo API + MCP. W&B Weave is open source (Hosted service under the W&B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W&B MCP server is MIT).

Other comparisons with Galileo API + MCP or W&B Weave

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report